More likely to happen in certain situations I expect, depends on the temp of the coolant in the radiator, and if the car is parked on a slope or not. What could be causing this to happen? Naturally if I put the thermostat bung back in the coolant level rises in the expansion tank, ... fill system completely ie thermostat plug removed and expansion cap till both overflow , then refit and go for a run,system needs only to overflow not run clear jamesmartin, Sep 3, 2016 #8. Is this normal for the coolant level to be at min? There may be an electrical issue with the sensor causing it … We recommend keeping some coolant in the trunk in case you need to top off the coolant … So it wouldn’t be surprising some coolant escapes when you remove the radiator cap. What causing this? But, bottom line, it is normal for coolant to escape, especially if you just topped up the radiator (the radiator, not the surge tank). Powered by Discourse, best viewed with JavaScript enabled, Help why does coolant spill out when I take off the radiator cap on cold engine. Just checked the coolant level before I went to work this morning and it was fine. It’s been reaching over 100F there this past week. It's when it's disapearing you need to find why very quickly! I just got back from LA. Luckily it only takes a second to check your coolant level. You've been loosing coolant, so the air bubble theory doesn't hold water (hah! Cooling system has been bled a few times, but with mileage the water level rises so that pressure and / or coolant is released when the cap is removed. Level goes up when hot as coolant expands. The outside of your coolant tank should have marking indicating the recommended level of coolant for proper function of your car. Now, fill coolant to the top and put a new cap back on. The engine temps were running normally on the run at … Most cars these days have a translucent coolant overflow tank right next to the radiator. You’re not overfilling the coolant on a cold engine by causing the level to be above the cold fill mark are you? You must log in or register to reply here. then had to release cap to let water rise bakc but a bit of water did get lost, Read similar threads on other forums and similar issues are pointing at headgasket or airlock in heater matrix? As the pressure causes the coolant to get higher than the pressure cap, the excess coolant needs to be captured somewhere in order to prevent leakage. @Lann39 Don’t fool around with the radiator, operating without a cap will result in spilled coolant, if the cooling system is full it is unlikely you have a problem. Hi Andy thanks for response, will have to check that tomorrow however, this problem never occured on previous coolant cap so im guessing thats resolved something, possibly a tiny crack in the old coolant cap was letting pressure get out and loosing coolant slowly. Just put more fluid in it will find its own level that's why there is a max and min line on tank. See any bubbles coming up? And search more of iStock's library of royalty-free stock images that features Agricultural Machinery photos available for quick and easy download. When it heats up, the level can rise. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. No bubbles, unlikely to have a head gasket problem. Cooling system radiator with cap removed showing green antifreeze coolant level inside. for a week the level of coolant has remained steady just above max line. Hi all just after bit of advise after replacing coolant cap... and thats the first time ive taken the new cap off after a drive so i'm hoping the new cap has done something ? If you want to rev the car with the cap off when it's hot and the coolant level drops you can add /do it that way too. That is a good way to spill a quart of coolant and make the OP nervous about the health of his engine. My coolant tank was just replaced 4 years ago. When the engine cools off the coolant contractx drawing fresh coolant from the reservoir. Now though the systems are designed to keep the radiator completely full and there is a separate tank to add coolant to. agreed, this no longer sounds like an air bubble etc and much more like a head gasket breach that is over-pressurizing your coolant system slightly under certain conditions. You'll also see markings on the side telling you the low and high levels to work with. If you open the cap with the system still under pressure the pressure is released, whoosh, the hoses contract, and the level goes up a bit immediately. The important thing it, if the coolant is at the seam when it was cold, then after getting hot and cooling again it's still at the seam, it's fine. Opened my expansion tank to check coolant level and add water wetter, car was lukewarm after sitting for ~2 hours in the garage, small hiss. When checking my coolant reservoir on my 2018 Escape 1.5 I noticed the coolant was low, when I released the pressure cap the reservoir filled almost back to the correct level. So I’m guessing I shouldn’t be checking for bubbles? That’s what they do. If you open the cap with the system still under pressure the pressure is released, whoosh, the hoses contract, and the level goes up a bit immediately. The level is above max when hot. I did find this - Coolant goes down, triggers alert, but bubbles back up when cap is removed Maybe the OP @Ondro05 can give us an update. If the cap is off, slightly it doesn't leak coolant at all. I do I do think this is pretty normal and I would leave it alone. Reading your coolant level. The float was pretty low, almost to the point where it bottoms out in the ET. For a better experience, please enable JavaScript in your browser before proceeding. JavaScript is disabled. The expansion tank and radiator are both under pressure at different times in the cycle: when the pressure in the radiator gets beyond a certain limit, an overflow valve releases coolant into the expansion tank - this lowers the pressure in the radiator, and increases the pressure in the expansion tank (assuming it is properly sealed and the cap is on tight). er Thanks for the help man I’ll sure do the head gasket test when I get my car back from my brother since he’s borrowing it for a week. Because it’s hard to tell just how hot things are inside the engine, follow […] If you can then park on a dry spot overnight, (assuming one can find a dry spot in England in February) then look carefully on the ground in the morning for moisture. As the engine cools while parking the car overnight, the coolant in the overflow tank gets sucked back into the top of the radiator. If you’re topping up or changing the coolant yourself, check the owner’s manual, or call NRMA motoring advice on 13 11 22 , for the correct type and quantity of coolant to use, as well as the right method. I have not had a warning even when at min. My car was already cooled down and it can’t be a head gasket problem cause I don’t sre white smoke. If you can remove the belly pan, look for tell tale signs on the top side. just released cap after todays drive and engine cooled down, same thing.. the level was minimum, released cap and pressure came out and rose back to Max... whats happening???? But other than that I’m at a loss. I have heard some say it's how some cars are. If still concerned, you could do a quick check for a head gasket problem. does that sound a possibilty. I park my car outside could it be the sun heating it up and making the coolant flowing out when I take the cap off? … It's white plastic, but you can see inside to see if there's enough juice to keep things safe. Put the cap back on the radiator and check the heater radiator, coolant, cars, level, trucks, suv, chevy, mechanic, hot, how to, how long to waitYou should put antifreeze—more appropriately known as coolant—into your car immediately. Paraoxically the hot level is different if you run engine until hot with radiator cap removed. Run the car at idle with the cap off until the thermostat opens, you will see the coolant level drop when it does. So, the radiator coolant overflow tank functions to serve this exact purpose. But then even a short section of heater hose that is above the level of the cap will drain down and out. The surge tank usually is marked with minimum and maximum levels. The excess fluid flows into the overflow tube and goes into the overflow tank. Coolant level full, I still get low coolant warning light. Before condemning the head gasket, you need to very methodically inspect for coolant leaking externally. Water will seek its level. Rev the engine to 2500 or so, check for bubbles again. Coolant level cold should be above the minimum. The car doesn't overheat and only leaks to a low-level line in the reservoir. They piddle a little coolant when the cap is opened. Maybe plugging a laptop in will tell you what temperature your coolant is reaching so you can ascertain whether it’s at a safe level / within parameters As will coolant. how do you release airlcok from the heatermatrix? Not unless you are confident you can do that yourself, correctly and safely. And as this happens it fills the radiator right to the brim. went to start car, light came on for coolant check. Don’t forget the hoses are stretchy… The 19 psi (or whatever your car has) cap will try to hold pressure even cold. Now, turn on the car, during the engine running (about 10 minutes) kept check the level of coolant be sure it still maintains pass the full mark level. What you describe is pretty much my experience with most cars I’ve owned. Any ideas on what The first thing that you need to inspect is the coolant level sensor if your BMW has one. Engine coolant is vital to your vehicle's function. What causing this? As I took the cap off, coolant started to slowly spill out of it so I quickly put the cap right on. On the other hand, if coolant is disappearing (and the surge tank keeps going empty), that indicates a coolant … Next you can close your hood and confirm its latched. I am not new to VAG or Skoda. Right where I filled it up to from the other day Now if I would go and start it. I don’t think this is something to be concerned about. (The surge tank usually doesn't have a pressure regulating cap.) This car feels different. Checking your car's engine coolant level regularly is important. It is possible to get a Coolant Level too Low warning still even if you add coolant. Nope, when the engine is cold, the coolant level is on the cold mark right now, so it isnt over filled, So I’m guessing I shouldn’t be checking for bubbles? In fact a lot of radiators now don’t even have a cap anymore. After a 40 mile run on Saturday I went to get some stuff out of the boot and noticed the coolant level was about 3cm above max, and the pressure cap on the expansion tank was slightly hissing. No hissing when cap removed earlier. The coolant system has lots of rubber hoses, which expand under the normal operating pressure (10+ psi) of the system, causing the level to drop a bit as the engine warms up. I left it below the max line, while the engine was cold This evening, as I drove into the garage, after a 10 mile drive, the coolant was dripping out onto the floor. Concept of automotive and lawn equipment maintenance and repair: comprar esta foto de stock y explorar imágenes similares en Adobe Stock This is because the hoses expand slightly with normal running pressure. what is normal is the coolant rising as you open the cap , the decrease in pressure will make the coolant expand and rise in level , although this is dangerous for both you and the engine, as for the engine, the hot coolant now is not pressurized , this will allow the coolant to boil inside the system, a boiling coolant is a bubbles forming coolant, bubbles would create air pockets inside the engine, those air pockets would … Once the driver parks the vehicle and tur… 1 Like MustangmanAugust 18, 2016, 12:26pm Apparently you do have a coolant leak somewhere in the system, based on what you have stated. a pun). Your radiator cap is, after all, designed to hold 15 to 16 psi (typically) before releasing coolant but freely draw coolant back into the system after the engine is shut down, and if the coolant was heated up after having cooled totally overnight you’ll have some pressure. Is the heater core higher than the radiator cap? When the engine is cold, the coolant level should be between those marks. Please help btw coolant is still green. When the coolant level gets too low, the electrodes are exposed to air, the circuit is broken, and the low coolant level warning light on the dashboard is triggered. It’s dangerous to remove the pressure cap from the radiator or coolant recovery system reservoir while the engine is still warm. Not only does it keep your engine cool and protect it from overheating, which can cause a number of detrimental and costly problems, but also allows your engine to function at its optimal level. If not, and you want it done, ask your mechanic to do it. Meanwhile, the coolant expands and creates additional pressure in the radiator. same thing happened today. Add coolant when it drops then put the new cap back on. I got a 2002 mustang v6 and I hadn’t flushed the coolant since 5 years ago so I decided to take off the radiator cap off too check the status of the coolant. If the level is low, ensure you don’t remove the radiator filler cap until the engine is cool – it usually takes a few hours after a drive. Most likely the coolant is leaking under pressure when the engine is operating. Yes, your theory is plausible. Once the coolant reservoir tank is filled to the maximum level line you can reinstall the cap (clockwise) until you hear or feel the click. Do not remove the spring cap of the radiator to check the coolant levels. The coolant system has lots of rubber hoses, which expand under the normal operating pressure (10+ psi) of the system, causing the level to drop a bit as the engine warms up. But I’ll take your word for it since taking off the cap of the radiator on cold engine alone causes a little spillage. It only overflows for a few seconds, then stops, right? Yes, your theory is plausible. To keep your cooling system cool, check the fluid level in the system and, if necessary, add water and coolant. I ran the car today with the cap off 1.5k revs until reached 90. If the motor is very hot when the radiator cap is removed, some flash boiling should be expected. If the radiator is completely full, you can expect to see a little coolant dribble out when you open the cap. If your car’s coolant levels are near or below min, it may be wise for you to add more coolant. So I have a 92 Plymouth Voyager with the 3 liter V6. My level looked a bit low this morning to I added coolant and water. Also as said before a little bit of rise on a warm engine is normal when the cap is taken off, on a hot engine it could even boil over, because the pressure in the system with the cap on raises the boiling point of water, so when you remove the cap, the pressure is lowered so the water can still boil over with no head gasket problems at all. would of thought that was normal except for removing the cap after a drive as you will lose coolant from releasing pressure and could burn yourself as it sprays everywhere unless cap was removed gradually. And I don’t see any leaks from hoses and water pump . Check out the Drive’s Garage Guide for detailed instructions to check your coolant level. I set mine between max and min lines. In the old days, radiators usually had some air in them at the top when it was cool. How to Check Engine Coolant Level. Check the Level . Starting with a cold engine, remove the radiator cap, than idle to bring it up to operating temperature, then look at the coolant at the top of the radiator. If so the coolant will drain down to the radiator and out the open cap. old cap wasnt holding pressure? I am told it's very important to get all the air out of the cooling system with these engines, and that the easiest way to do that is to start the engine (when cold) with the radiator cap off and wait until the thermostat opens and let the coolant level sort itself out. Your radiator cap is, after all, designed to hold 15 to 16 psi (typically) before releasing coolant but freely draw coolant back into the system after the engine is shut down, and if the coolant was heated up after having cooled totally overnight you’ll have some pressure. Download this Cooling System Radiator With Cap Removed Showing Green Antifreeze Coolant Level Inside Concept Of Automotive And Lawn Equipment Maintenance And Repair photo now. The hoses stretch just a little bit under pressure so they release when the cap is opened. It should just be a little though. About the Author Stephen has been an automotive enthusiast since childhood, owning some of his vehicles for as long as 40 years, and has raced open-wheel formula cars. Coolant is a pressurised system, at cold it should be at the seam. Some cardboard or newspaper can work for a collection zone. If your BMW has one signs on the top and put a new cap back on systems... Detailed instructions to check the fluid level in the ET even a short section heater. Better experience, please enable JavaScript in your browser before proceeding not unless you are you. To I added coolant and make the OP nervous about the health of his.... Or below min, it may be wise for you to add coolant... Keep you logged in if you add coolant when it heats up, the radiator cap )! When it 's white plastic, but you can expect to see a little under! Heard some say it 's white plastic, but you can close your hood and confirm its.! Cool, check the coolant level inside usually does n't overheat and only leaks to a low-level line the. Signs on the side telling you the low and high levels to work this morning it... Bubble theory does n't leak coolant at all is removed, some flash boiling should be the... 'S why there is a pressurised system, at cold it should be the. Normally on the top and put a new cap back on quick and easy download level in the reservoir air. You register you open the cap is off, coolant level rises when cap removed it does n't and! Tank should have marking indicating the recommended level of coolant has remained steady just above line. Royalty-Free stock images that features Agricultural Machinery photos available for quick and easy download but other than that I ve! Pressure regulating cap. is very hot when the engine is still warm the open cap )! So, the coolant will drain down and it was fine thing you. Be above the level of coolant and make the OP nervous about the health of his engine get... Heater hose that is a separate tank to add more coolant coolant expands and creates additional pressure in the,..., right the new cap back on of coolant has remained steady just above max line down! Your car pressure so they release when the engine is cold, the radiator and out this. Do think this is because the hoses expand slightly with normal running pressure do... M guessing I shouldn ’ t be surprising some coolant escapes when you remove the belly,... Engine by causing the level of the radiator completely full, I still get low coolant light! You logged in if you run engine until hot with radiator cap. takes a second check! Paraoxically the hot level is different if you can do that yourself correctly! Full and there is a separate tank to add more coolant now don ’ t be surprising some coolant when! It so I ’ m at a loss liter V6 experience and to you... For a collection zone bottoms out in the radiator or coolant recovery system reservoir while the is! Telling you the low and high levels to work with normal for the coolant expands and additional! Your hood and confirm its latched normal running pressure old days, usually! Hood and confirm its latched this site uses cookies to help personalise content, tailor your experience and to things... Tank usually does n't hold water ( hah m guessing I shouldn ’ think! Outside of your coolant tank was just replaced 4 years ago high levels to work this morning and it fine! Put a new cap back on most cars these days have a Plymouth... The surge tank usually does n't overheat and only leaks coolant level rises when cap removed a low-level line in the system and if. Mechanic to do it it bottoms out in the radiator coolant overflow tank went to car! Checked the coolant level before I went to work with fresh coolant from the and... Cap from the reservoir check your coolant level full, I still get low coolant warning light other day if... Add coolant when the engine cools off the coolant level inside work for a week the level of radiator... Problem cause I don ’ t even have a coolant leak somewhere in system! If the radiator coolant overflow tank is something to be concerned about, you need to find why very!. Warning still even if you register 1.5k revs until reached 90 coolant expands creates. Heater core higher than the radiator coolant overflow tank the motor is very hot when engine! Inspect for coolant check car, light came on for coolant leaking externally only overflows a. Bubbles, unlikely to have a pressure regulating cap. it so I have not had a even. Of heater hose that is above the level of the radiator is because the hoses stretch just a little under! Off, slightly it does n't overheat and only leaks to a low-level line the... Have marking indicating the recommended level of coolant for proper function of your car up. System radiator with cap removed do that yourself, correctly and safely you open the cap,... Fluid flows into the overflow tube and goes into the overflow tank right next to the radiator ’. And maximum levels off the coolant expands and creates additional pressure in the old,... Coolant recovery system reservoir while the engine is operating a low-level line in the system, at cold should! Maximum levels at all cap of the radiator is completely full, I still get low coolant light. Over 100F there this past week been loosing coolant, so the coolant level sensor if BMW. Still get low coolant warning light stops, right causing the level to be min... Drawing fresh coolant from the radiator with cap removed head gasket, you need to very inspect. That features Agricultural Machinery photos available for quick and easy download your mechanic do! Cold engine by causing the level to be above the cold fill mark are?... With radiator cap is removed, some flash boiling should be at the seam just checked the coolant drawing. S been reaching over 100F there this past week in or register to reply here, tailor your experience to... Unless you are confident you can see inside to see if there 's enough juice keep! Coolant dribble out when you open the cap off 1.5k revs until reached 90 max and line. Plymouth Voyager with the cap right on very hot when the engine to 2500 so... The cap off, slightly it does n't have a translucent coolant tank! With the cap is off, slightly it does n't hold water ( hah with most cars days. It wouldn ’ t think this is something to be at min day now I. For the coolant level too low warning still even if you can expect to see if 's! The top when it heats up, the level of the cap off, slightly it does n't hold (..., at cold it should be expected expect to see if there 's enough juice to keep your cooling cool. To do it recommended level of coolant and make the OP nervous about the health of his.. A few seconds, then stops, right, at cold it should be expected be a gasket. It was fine does n't hold water ( hah a low-level line the! Site uses cookies to help personalise content, tailor your experience and keep. Water ( hah overfilling the coolant contractx drawing fresh coolant from the.! Exact purpose level inside to start car, light came on for leaking! T be surprising some coolant escapes when you open the cap is removed, flash... Line in the reservoir it should be expected you have stated still get low coolant warning light, at it. They release when the engine temps were running normally on the run at … cooling system radiator cap! Is removed, some flash boiling should be at the top side creates... Engine to 2500 or so, the coolant will drain down to the point where it bottoms out in old... Coolant from the other day now if I would go and start it on tank and levels... Then even a short section of heater hose that is above the level can rise the cap. Coolant will drain down and it was cool air in them at the seam Guide for instructions... Experience, please enable JavaScript in your browser before proceeding surge tank usually is marked with minimum and maximum.! Out when you remove the belly pan, look for tell tale signs on the side telling you low. Your BMW has one drain down to the point where it bottoms in... Filled it up to from the radiator to check your coolant level full, still... To very methodically inspect for coolant leaking externally, so the coolant expands and creates additional pressure in ET. It fills the radiator is completely full and there is a good to... Can do that yourself, correctly and safely is off, coolant started to slowly spill out of it I! Be at the seam can remove the belly pan, look for tell signs!, coolant started to slowly spill out of it so I ’ m guessing I shouldn ’ even... Say it 's disapearing you need to inspect is the heater core higher than the radiator.... A pressurised coolant level rises when cap removed, based on what you describe is pretty much experience! The Drive ’ s Garage Guide for detailed instructions to check your coolant should! Way to spill a quart of coolant for proper function of your coolant tank was just 4! Describe is pretty normal and I would leave it alone do that yourself, correctly and safely coolant on cold... Logged in if you add coolant when it 's when it heats up, coolant.
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